Photocatalytic behavior of TiO2 films synthesized by microwave irradiation

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Abstract

Titanium dioxide was synthesized on glass substrates from titanium (IV)isopropoxide and hydrochloride acid aqueous solutions through microwave irradiation using as seed layer either fluorine-doped crystalline tin oxide (SnO2:F) or amorphous tin oxide (a-SnOx). Three routes have been followed with distinct outcome: (i) equimolar hydrochloride acid/water proportions (1HCl:1water) resulted in nanorod arrays for both seed layers; (ii) higher water proportion (1HCl:3water) originated denser films with growth yield dependent on the seed layer employed; while (iii) higher acid proportion (3HCl:1water) hindered the formation of TiO2. X-ray diffraction (XRD) showed that the materials crystallized with the rutile structure, possibly with minute fractions of brookite and/or anatase. XRD peak inversions observed for the materials synthesized on crystalline seeds pointed to preferred crystallographic orientation. Electron diffraction showed that the especially strong XRD peak inversions observed for TiO2 grown from the 1HCl:3water solution on SnO2:F originated from a [001] fiber texture. Transmittance spectrophotometry showed that the materials with finer structure exhibited significantly higher optical band gaps. Photocatalytic activity was assessed from methylene blue degradation, with the 1HCl:3water SnO2:F material showing remarkable degradability performance, attributed to a higher exposure of (001) facets, together with stability and reusability.
Original languageEnglish
Pages (from-to)262-270
Number of pages9
JournalCatalysis Today
Volume278
DOIs
Publication statusPublished - 2016

Fingerprint

Microwave irradiation
Seed
Tin oxides
X ray diffraction
Titanium dioxide
Acids
Crystalline materials
Fluorine
Water
Methylene Blue
Optical band gaps
Spectrophotometry
Reusability
Nanorods
Electron diffraction
Crystal orientation
Titanium
Textures
Degradation
Glass

Keywords

  • TiO2
  • Microwave irradiation
  • Nanorod arrays
  • Seed layer
  • Rutile structure
  • PHOTOCATALYSIS

Cite this

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title = "Photocatalytic behavior of TiO2 films synthesized by microwave irradiation",
abstract = "Titanium dioxide was synthesized on glass substrates from titanium (IV)isopropoxide and hydrochloride acid aqueous solutions through microwave irradiation using as seed layer either fluorine-doped crystalline tin oxide (SnO2:F) or amorphous tin oxide (a-SnOx). Three routes have been followed with distinct outcome: (i) equimolar hydrochloride acid/water proportions (1HCl:1water) resulted in nanorod arrays for both seed layers; (ii) higher water proportion (1HCl:3water) originated denser films with growth yield dependent on the seed layer employed; while (iii) higher acid proportion (3HCl:1water) hindered the formation of TiO2. X-ray diffraction (XRD) showed that the materials crystallized with the rutile structure, possibly with minute fractions of brookite and/or anatase. XRD peak inversions observed for the materials synthesized on crystalline seeds pointed to preferred crystallographic orientation. Electron diffraction showed that the especially strong XRD peak inversions observed for TiO2 grown from the 1HCl:3water solution on SnO2:F originated from a [001] fiber texture. Transmittance spectrophotometry showed that the materials with finer structure exhibited significantly higher optical band gaps. Photocatalytic activity was assessed from methylene blue degradation, with the 1HCl:3water SnO2:F material showing remarkable degradability performance, attributed to a higher exposure of (001) facets, together with stability and reusability.",
keywords = "TiO2, Microwave irradiation, Nanorod arrays, Seed layer, Rutile structure, PHOTOCATALYSIS",
author = "D Nunes and A Pimentel and Pinto, {J V} and Calmeiro, {T. R.} and S Nandy and P Barquinha and L Pereira and Carvalho, {P A} and E Fortunato and R Martins",
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language = "English",
volume = "278",
pages = "262--270",
journal = "Catalysis Today",
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T1 - Photocatalytic behavior of TiO2 films synthesized by microwave irradiation

AU - Nunes, D

AU - Pimentel, A

AU - Pinto, J V

AU - Calmeiro, T. R.

AU - Nandy, S

AU - Barquinha, P

AU - Pereira, L

AU - Carvalho, P A

AU - Fortunato, E

AU - Martins, R

N1 - info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F84215%2F2012/PT# info:eu-repo/grantAgreement/FCT/3599-PPCDT/126341/PT# info:eu-repo/grantAgreement/FCT/5876/147333/PT# Sem PDF. European project CEOPS (309984)

PY - 2016

Y1 - 2016

N2 - Titanium dioxide was synthesized on glass substrates from titanium (IV)isopropoxide and hydrochloride acid aqueous solutions through microwave irradiation using as seed layer either fluorine-doped crystalline tin oxide (SnO2:F) or amorphous tin oxide (a-SnOx). Three routes have been followed with distinct outcome: (i) equimolar hydrochloride acid/water proportions (1HCl:1water) resulted in nanorod arrays for both seed layers; (ii) higher water proportion (1HCl:3water) originated denser films with growth yield dependent on the seed layer employed; while (iii) higher acid proportion (3HCl:1water) hindered the formation of TiO2. X-ray diffraction (XRD) showed that the materials crystallized with the rutile structure, possibly with minute fractions of brookite and/or anatase. XRD peak inversions observed for the materials synthesized on crystalline seeds pointed to preferred crystallographic orientation. Electron diffraction showed that the especially strong XRD peak inversions observed for TiO2 grown from the 1HCl:3water solution on SnO2:F originated from a [001] fiber texture. Transmittance spectrophotometry showed that the materials with finer structure exhibited significantly higher optical band gaps. Photocatalytic activity was assessed from methylene blue degradation, with the 1HCl:3water SnO2:F material showing remarkable degradability performance, attributed to a higher exposure of (001) facets, together with stability and reusability.

AB - Titanium dioxide was synthesized on glass substrates from titanium (IV)isopropoxide and hydrochloride acid aqueous solutions through microwave irradiation using as seed layer either fluorine-doped crystalline tin oxide (SnO2:F) or amorphous tin oxide (a-SnOx). Three routes have been followed with distinct outcome: (i) equimolar hydrochloride acid/water proportions (1HCl:1water) resulted in nanorod arrays for both seed layers; (ii) higher water proportion (1HCl:3water) originated denser films with growth yield dependent on the seed layer employed; while (iii) higher acid proportion (3HCl:1water) hindered the formation of TiO2. X-ray diffraction (XRD) showed that the materials crystallized with the rutile structure, possibly with minute fractions of brookite and/or anatase. XRD peak inversions observed for the materials synthesized on crystalline seeds pointed to preferred crystallographic orientation. Electron diffraction showed that the especially strong XRD peak inversions observed for TiO2 grown from the 1HCl:3water solution on SnO2:F originated from a [001] fiber texture. Transmittance spectrophotometry showed that the materials with finer structure exhibited significantly higher optical band gaps. Photocatalytic activity was assessed from methylene blue degradation, with the 1HCl:3water SnO2:F material showing remarkable degradability performance, attributed to a higher exposure of (001) facets, together with stability and reusability.

KW - TiO2

KW - Microwave irradiation

KW - Nanorod arrays

KW - Seed layer

KW - Rutile structure

KW - PHOTOCATALYSIS

U2 - 10.1016/j.cattod.2015.10.038

DO - 10.1016/j.cattod.2015.10.038

M3 - Article

VL - 278

SP - 262

EP - 270

JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

ER -